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Finding the Fourth Proportional to 884.45, 1,220.42 and 491.40

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Solution

The fourth proportional to 884.45, 1,220.42 and 491.40 is: 678.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.45 : 1,220.42 = 491.40 : x
  2. Step 2: Convert to fraction form
    884.45/1,220.42 = 491.40/x
  3. Step 3: Cross multiply
    884.45x = 1,220.42 × 491.40
  4. Step 4: Simplify right side
    884.45x = 599,715.62
  5. Step 5: Solve for x
    x = 599,715.62/884.45
  6. Step 6: Final answer
    x = 678.06

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.